When looking to purchase a Hydro Flask, one of the most common questions people have is “How many ounces is a full Hydro Flask?” The amount of liquid a Hydro Flask can hold varies depending on the specific size and model. Hydro Flask offers a range of different bottle sizes, from 12 oz all the way up to 64 oz. Here’s a quick overview of how many ounces each of the most popular Hydro Flask sizes contains when full:
12 oz Hydro Flask
A 12 oz Hydro Flask holds, you guessed it, 12 oz of liquid when completely filled. This is equal to 1.5 cups or 355 ml. The 12 oz size is great for short trips or for storing smaller amounts of water or drinks.
18 oz Hydro Flask
The 18 oz Hydro Flask holds a maximum of 18 oz or 2.25 cups of liquid when full. This amounts to about 532 ml. The 18 oz is a lightweight and easy to carry option perfect for school, work, or light hiking.
21 oz Hydro Flask
A 21 oz Hydro Flask holds up to 21 oz or 2.625 cups when filled all the way. This equates to about 624 ml. The 21 oz Hydro Flask is popular for daily use as it provides ample hydration without being overly large or heavy.
24 oz Hydro Flask
The 24 oz Hydro Flask, as you may have guessed, holds 24 oz or 3 cups maximum. This is approximately 709 ml. The 24 oz size is great for regular daily use as it can hold a good amount of water or other beverages.
32 oz Hydro Flask
The 32 oz wide mouth Hydro Flask holds 32 oz or 4 cups when completely topped off. This amounts to approximately 946 ml. The 32 oz is a great mid-size option suitable for all day use on the go or at the office.
40 oz Hydro Flask
The 40 oz Hydro Flask can hold a maximum capacity of 40 oz or 5 cups when full. This equates to about 1183 ml. The 40 oz is a popular large size perfect for long days out hiking, working, or traveling.
64 oz Hydro Flask
The extra large 64 oz Hydro Flask can hold a whopping 64 oz or 8 cups when filled to the brim. This amounts to approximately 1892 ml. The 64 oz “Growler” size is ideal for storing large amounts of water or beverage for long trips or to share.
Summary
| Hydro Flask Size | Ounces When Full | Cups When Full |
|---|---|---|
| 12 oz | 12 oz | 1.5 cups |
| 18 oz | 18 oz | 2.25 cups |
| 21 oz | 21 oz | 2.625 cups |
| 24 oz | 24 oz | 3 cups |
| 32 oz | 32 oz | 4 cups |
| 40 oz | 40 oz | 5 cups |
| 64 oz | 64 oz | 8 cups |
As the table shows, Hydro Flasks range from holding 12 oz when full up to a maximum of 64 oz. The amount of liquid a Hydro Flask holds depends entirely on the specific size you purchase. The popular everyday sizes are 18 oz, 24 oz, or 32 oz, while the larger 40 oz and 64 oz sizes are great for long term hydration needs or sharing.
Factors That Affect How Much a Hydro Flask Holds
While the size of a Hydro Flask dictates the maximum ounces it can hold, there are a few other factors that can affect the actual amount of liquid the bottles can carry:
- Type of liquid – Thicker liquids like smoothies take up more volume than thinner liquids like water.
- Ice – Adding ice cubes will take up internal space, decreasing the amount of liquid that will fit.
- Foam – Fizzy drinks like soda produce foam near the top which reduces overall liquid capacity.
- Narrow vs Wide Mouth – Wide mouth bottles hold slightly less than narrow mouth versions of the same size.
Keep these factors in mind when filling up your Hydro Flask and you may notice small capacity variations from the stated maximum ounces for that size. The differences should be minor though and not affect the overall usefulness of each Hydro Flask size.
Typical Contents Each Size Holds
To give you a better sense of how much each Hydro Flask size actually holds in practical use, here are some examples of common beverages and their approximate volumes in different sized bottles:
12 oz Hydro Flask
- 1 can of soda
- 1 cup of coffee
- 1.5 cups of water
18 oz Hydro Flask
- 1.5 cans of soda
- 1.5 cups of coffee
- 2 cups of water
24 oz Hydro Flask
- 2 cans of soda
- 2 cups of coffee
- 3 cups of water
32 oz Hydro Flask
- 2.5 cans of soda
- 3 cups of coffee
- 4 cups of water
40 oz Hydro Flask
- 3 cans of soda
- 4 cups of coffee
- 5 cups of water
64 oz Hydro Flask
- 5 cans of soda
- 6 cups of coffee
- 8 cups of water
As you can see, the larger Hydro Flask sizes like the 40 oz and 64 oz have the flexibility to hold several servings of drinks, making them great for keeping well hydrated over extended periods or for sharing.
Choosing the Right Hydro Flask Size
When deciding what size Hydro Flask to buy, think about your intended uses for it. Here are some recommendations based on activity:
- Desk job – 18 oz, 24 oz, or 32 oz for sipping throughout the workday
- Outdoor adventures – 32 oz, 40 oz, or 64 oz to stay hydrated on long hikes or trips
- Sports – 21 oz or 24 oz for water/sports drink while playing and reusable afterwards
- Travel – 40 oz or 64 oz to avoid buying drinks and to share with others
- Kids – 12 oz is the perfect starter size for younger children
Also consider if you want to carry your Hydro Flask in a cupholder, bag mesh pocket, or backpack side pocket. The 12 oz to 24 oz sizes are the most portable and easiest to take on the go without taking up too much space.
Tips for Filling Your Hydro Flask
Follow these tips when filling up your Hydro Flask to get the most out of its carrying capacity:
- Always leave a little space at the top rather than overfilling – this allows mixing and prevents spills
- Lay bottles on their side when filling for easier viewing of liquid levels
- Add ice cubes after filling with liquid instead of before to prevent overflow
- Use a funnel or straw when filling narrow mouth bottles to prevent spilling
- Hold bottles upright when filling wide mouth versions to see ounces
- Refer to volume markings on the inside if you need an exact measure
Getting familiar with how much liquid your Hydro Flask realistically holds will prevent overfilling. And with the tips above, you can fill your bottle properly each time to get the most out of every ounce.
Alternative Insulated Water Bottle Sizes Comparison
Hydro Flask isn’t the only insulated bottle brand on the market. Here’s a look at how maximum capacities of some top alternatives compare:
| Bottle Brand & Size | Total Ounces Held |
|---|---|
| Yeti Rambler 12 oz | 12 oz |
| Yeti Rambler 18 oz | 18 oz |
| CamelBak Chute 20 oz | 20 oz |
| Klean Kanteen 27 oz | 27 oz |
| Thermoflask 24 oz | 24 oz |
| Nalgene 32 oz | 32 oz |
| Contigo Autoseal 40 oz | 40 oz |
While capacities vary, all these major brands offer popular sizes in the 12-40 oz range. The 32 oz and 40 oz options from brands like Hydro Flask, Klean Kanteen, and Yeti provide ample hydration for most use cases.
Frequently Asked Questions
Does the lid on a Hydro Flask reduce the capacity?
No, Hydro Flask lids are designed to provide a tight seal without reducing the internal volume of their bottles. The ounces listed for each size represent the total capacity up to the brim.
Do different mouth types change how much a Hydro Flask holds?
There is a small difference between the wide mouth and standard mouth capacities, with wide mouths holding slightly less. However, Hydro Flask displays the standard capacity amount regardless of mouth type.
Can you fit extra liquid in a Hydro Flask after filling to the top?
It’s not recommended to overfill Hydro Flasks past their stated capacities. Doing so can cause leaking or make a mess when trying to drink. Fill to the maximum amount and enjoy refills when needed.
Do all Hydro Flask sizes have volume markings on the inside?
Yes, all standard Hydro Flasks have volume markings in ounces and milliliters displayed on the interior. This makes it easy to track exactly how much liquid you have added.
Should you leave space at the top when filling a Hydro Flask?
It’s recommended to leave a little room at the top rather than filling completely to the brim. This allows you to shake or mix the contents more easily without spilling.
Conclusion
Determining how many ounces a Hydro Flask holds comes down to the specific size you purchase. But most popular options fall in the 18 oz to 40 oz range, providing great versatility and portability. Consider your intended use, desired carrying capacity, and drinking habits when choosing a Hydro Flask size. And be sure to leave a bit of space at the top when filling it up to get the most enjoyment from every ounce.
